One important item which nobody has brought up is that a C unit will get offered a lot of B Loads at B rates, wheras a D will always get or should always get C rates even though they might get offered a B load.
That is interesting information, but when considering whether to invest in a C or D truck, it is not something to assign heavy weight to (My opinion based on our numbers).
We have driven both CR, D and DR trucks, and have seen no difference in the number of so-called B loads that are offered, let alone at what rate (B or C or D).
As a practical matter, it does not matter what they call the load (B, C, D). What matters is how much the load pays. For us, low paying B loads are treated the same as low paying C or D loads. They are delcined.
In over 225 loads hauled in our CR unit, since June, 2006, only seven have been officially designated and priced as surface expedite B loads. Five of them were longer "team" runs. Two were short runs. Average pay per mile for these seven B loads was $1.97 (includes deadhead + loaded miles). Total miles for these seven runs was 4,597 (includes deadhead + loaded).
Given these numbers, I'd love to see more surface expedite B loads offered to our CR truck. As with other types of loads, we can decline the unprofitable ones and accept the profitable.
In fact, we have done exactly that. From June, 2006, to today, we have been offered 19 B loads and accepted 9. In other words, our B load acceptance rate is just under 50%. In about 19 months, 19 B load offers have been received, or an average of 1 B load offer per month.
That's what I mean by not assigning much weight to the fact that B loads are offered to C trucks. They are offered to D trucks too, and sometimes they pay as good or better than C or D freight. Also, B loads are not offered to straight trucks often enough to be important in a C vs. D analysis.
That is true, to the extent that our numbers are an indicator. Numbers vary from contractor to contractor. Others may have numbers that make a different case.